Cumulative Review Chapters 1 & 2

The expression x + y represents the sum of two numbers, where x and y can be any numerical values. Therefore, the phrase "a number plus another number" accurately describes the expression x + y.

To evaluate the expression 4 x (3+7), we first perform the addition within the parentheses, which gives us 10. Then, we multiply this result by 4, which gives us 40. Therefore, the correct answer is 40.

To solve the equation k - 4 = 9 using mental math, we need to isolate the variable k. Adding 4 to both sides of the equation, we get k = 13. Therefore, the correct answer is 13.

To evaluate 4x - 9 for x = 6, we substitute x with 6 in the expression. Therefore, 4(6) - 9 = 24 - 9 = 15.

The pattern in the given number sequence is that each term is obtained by adding consecutive odd numbers to the previous term. Starting with 0, we add 1 to get 3, then add 2 to get 7, and so on. Therefore, the next three terms in the pattern would be obtained by adding 3, 4, and 5 to the previous term, which is 12. This gives us 12 + 3 = 15, 15 + 4 = 19, and 19 + 5 = 24. Hence, the correct answer is 18, 25, 33.

The equation 39 - 19 = y is the same as y + 19 = 39 because they both represent the same mathematical operation of subtracting 19 from 39 to find the value of y.

To solve the given expression, we first perform the operation inside the parentheses: 2 + 13 = 15. Then, we multiply this sum by 4: 4 x 15 = 60. Finally, we subtract 60 from 64: 64 - 60 = 4. Therefore, the correct answer is 4.

There are a total of 28 students. Out of these, 4 students read both The Red Pony and The Hobbit. 15 students read the first book but not the second. 5 students read neither book. To find the number of students who read only The Hobbit, we subtract the students who read both books and the students who read only the first book from the total number of students. Therefore, the answer is 4 students.

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